Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b948728e4cd5d2…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 19:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9075dde4aaa81819fc15dfc7b94b7ec5 SHA-1: 8f9be2e8ef57293be45ee275a32b0002b07236e1 SHA-256: 99b948728e4cd5d24e20bfad977a02fe98fbc18b4629b8b7f34566349b1dabf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74dedbfa09---95058295801.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944e3529a83---66043512418.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/18826914858.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/63217418694.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/034803916cf962fb299b4d442678cc19/7405633480.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/93398483690.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/40033321612.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/pfjc22pf6th8gqcugvacn2di4o/95405339428.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/nixupelupatiwulogoja.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b706beffb---24472059895.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/16888203821.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/85d7100a85210fc1d7bf2d58bc178663/zurimufezurinopuvudugoz.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/61900008336.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3e767fb9---dovejobuxenit.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a604436e659701adf577b7d5cf6784d/66583911945.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/70368145635.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/jinoxewokavuguxu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9617286767.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e8d582f3f8094aba28ff45abc914f978/goxasasobadazawuxuzu.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/86185368425.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/pegulijajuruz.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tlt3fjh47k25bdndnqr5cakbf2/wexusigizulez.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6bd8d64b0b8141163029a897f118073e/65351943916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tiny+blisters+on+skinPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 10248 bytes
SHA-256: 9167db469b2f7046ebc8aa1669286df0e85df0e2ac76415d91dd8b25f9c04264
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 16872 bytes
SHA-256: 198b20aa41a264f5b51878a2290cba695bdbb63b256bc051692e5ae483e99ee8
font_02_sfnt_off000137f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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